Viroids are composed of nothing more than a single, circular strand of genetic material, and cause disease in plant cells. Replicating in the nuclei of plant cells, they often cause striking diseases in their host plants. Lacking even a protective shell of protein, viroids do not even spread easily from one cell or plant to another.
A pathogenic agent that has virus-like properties composed only of a small amount of RNA and containing no protein; the RNA is reproduced during infection.
the smallest of viruses; a plant virus with its RNA arranged in a circular chromosome without a protein coat
a piece of genetic material that, unlike a virus, has no protein coat
a small infectious nucleic acid that does not have a protein coat
a type of very primitive virus, but it only affects plants
( vy-roid) A plant pathogen composed of molecules of naked RNA only several hundred nucleotides long.
An infectious nucleic acid without a protein coat that causes potato spindle tuber or chrysanthemum stunt.
any of a class of infectious agents consisting of a single-stranded closed circular RNA lacking a capsid. The RNA does not code for proteins and is not translated; it is replicated by host cell enzymes. Viroids are known to cause several plant diseases.
A small RNA molecule with viruslike properties.
Any of numerous kinds of small particles (250-400 nucleotides) of circular, single-stranded RNA that is unencapsidated and encodes no known proteins. ()
Infective form of nucleic acid without a protective coat of protein; unencapsulated single-stranded RNA molecules.
Viroids are plant pathogens that consist of a short stretch (a few hundred nucleobases) of highly complementary, circular, single-stranded RNA without the protein coat that is typical for viruses. The smallest so far is a 220 nucleobase scRNA (small cytoplasmic RNA) associated with the rice yellow mottle sobemovirus (RYMV)http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9499801&dopt=Abstract. In comparison, the genome of the smallest known viruses capable of causing an infection by themselves are around 2 kilobases in size.